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Navistar said at a July 19 press conference a third-party test it commissioned shows the 2010 International ProStar+ with MaxxForce 13 Advanced EGR engine leads all Class 8 trucks in “fluid economy” – a measurement of diesel fuel plus liquid urea consumed.

Navistar’s said its International ProStar+ consistently outperformed competing trucks by nearly 1 percent to 2.5 percent in efficiency measuring diesel and urea, which is used in selective catalytic reduction (SCR) technology employed by other truck engine manufacturers.

“With the ProStar+, we continue to have the most efficient Class 8 truck on the road,” said Jim Hebe, Navistar senior vice president for North American sales operations.

Navistar commissioned the Transportation Research Center Inc. in East Liberty, Ohio, to conduct a head-to-head fluid economy comparison. TRC performed independent Technology & Maintenance Council Type 4 testing of three EPA 2010-compliant trucks: International ProStar+, Freightliner Cascadia powered by the Detroit DD15 engine and a Kenworth T660 powered by a 15-liter Cummins ISX, both with liquid-urea SCR.

The engines were rated with comparable horsepower and torque. Navistar executives chose versions of their competitors’ trucks that dealers noted as the most fuel-efficient powertrain packages available.

Only one tank of diesel per truck was allowed, and each ran three 444-mile routes on public highways. Drivers and trailers were switched at the mid-point of each test.

For more information on the testing and results, visit www.internationaltrucks.com/results.